/**
 * Copyright 2007 The Apache Software Foundation
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.hadoop.hbase;

import org.apache.hadoop.hbase.conf.Configuration;
import org.apache.hadoop.hbase.util.VersionInfo;

/**
 * Adds HBase configuration files to a Configuration
 */
public class HBaseConfiguration extends Configuration {

	private static void checkDefaultsVersion(Configuration conf) {
		if (conf.getBoolean("hbase.defaults.for.version.skip", Boolean.FALSE))
			return;
		String defaultsVersion = conf.get("hbase.defaults.for.version");
		String thisVersion = VersionInfo.getVersion();
		if (!thisVersion.equals(defaultsVersion)) {
			throw new RuntimeException("hbase-default.xml file seems to be for and old version of HBase (" + defaultsVersion
					+ "), this version is " + thisVersion);
		}
	}

	public static Configuration addHbaseResources(Configuration conf) {
		conf.addResource("hbase-default.xml");
		conf.addResource("hbase-site.xml");

		checkDefaultsVersion(conf);
		return conf;
	}

	/**
	 * Creates a Configuration with HBase resources
	 * @return a Configuration with HBase resources
	 */
	public static Configuration create() {
		Configuration conf = new Configuration();
		return addHbaseResources(conf);
	}

	/**
	 * Creates a clone of passed configuration.
	 * @param that Configuration to clone.
	 * @return a clone of passed configuration.
	 */
	public static Configuration create(final Configuration that) {
		return new Configuration(that);
	}
}
